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A horned dinosaur from the El Picacho Formation of west Texas, and review of ceratopsian dinosaurs from the American southwest

Published online by Cambridge University Press:  20 May 2016

Thomas M. Lehman
Thomas M. Lehman*
Affiliation:
Department of Geosciences, Texas Tech University, Lubbock 79409
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Abstract

Fragmentary remains of a long-frilled ceratopsian dinosaur from the El Picacho Formation (Maastrichtian) of West Texas pertain to an undescribed form. The remains are, however, insufficient to fully characterize this species. This ceratopsian has long thick squamosals with marginal undulations, nasals lacking a discrete horncore, a thin parietal, and large trihedral epijugals. The braincase has very thick lateral walls, and a well-developed postfrontal foramen. Four species of horned dinosaurs are known from Upper Cretaceous strata of the American Southwest: Pentaceratops sternbergii, Chasmosaurus mariscalensis, Torosaurus utahensis, and the El Picacho ceratopsian. All of these belong to the subfamily Chasmosaurinae.

Type
Research Article
Information
Journal of Paleontology , Volume 70 , Issue 3 , May 1996 , pp. 494 - 508
Copyright
Copyright © The Paleontological Society 

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